Daniel Choate if you stick with the same model and year you do not have to worry about potentially having to find brackets mounts etc. to fit the engine. So that would be the easiest. You can most likely use different years for as long as it is the same series. Your 1998 should have the same setup, brackets and mounts right to the 2004 model year and should be a straight forward swap.
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You can of course swap some other GM engine into your Isuzu but that get's a bit more involved.
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You can of course swap some other GM engine into your Isuzu but that get's a bit more involved. It will all depend on your abilities, tools etc.
Daniel Choate if you stick with the same model and year you do not have to worry about potentially having to find brackets mounts etc. to fit the engine. So that would be the easiest. You can most likely use different years for as long as it is the same series. Your 1998 should have the same setup, brackets and mounts right to the 2004 model year and should be a straight forward swap.
You can of course swap some other GM engine into your Isuzu but that get's a bit more involved.